//outside.js

const ctx = "@@clickoutsideContext";

export default {
	bind(el, binding, vnode) {
		const ele = el;
		const documentHandler = e => {
			if (!vnode.context || ele.contains(e.target)) {
				return false;
			}
			// 调用指令回调
			if (binding.expression) {
				vnode.context[el[ctx].methodName](e);
			} else {
				el[ctx].bindingFn(e);
			}
		};
		// 将方法添加到ele
		ele[ctx] = {
			documentHandler,
			methodName: binding.expression,
			bindingFn: binding.value
		};

		setTimeout(() => {
			document.addEventListener("touchstart", documentHandler); // 为document绑定事件
		});
	},
	update(el, binding) {
		const ele = el;
		ele[ctx].methodName = binding.expression;
		ele[ctx].bindingFn = binding.value;
	},
	unbind(el) {
		document.removeEventListener("touchstart", el[ctx].documentHandler); // 解绑
		delete el[ctx];
	}
};
